| Year | Rank | Trend | +/- | Quantity |
|---|---|---|---|---|
| 2013 | 661 | -68 | 427 | |
| 2012 | 593 | +13 | 484 | |
| 2011 | 606 | -94 | 473 | |
| 2010 | 512 | -30 | 582 | |
| 2009 | 482 | -65 | 639 | |
| 2008 | 417 | -14 | 771 | |
| 2007 | 403 | -61 | 812 | |
| 2006 | 342 | -29 | 966 | |
| 2005 | 313 | -43 | 1,021 | |
| 2004 | 270 | -19 | 1,201 | |
| 2003 | 251 | -27 | 1,303 | |
| 2002 | 224 | -13 | 1,395 | |
| 2001 | 211 | -11 | 1,495 | |
| 2000 | 200 | -14 | 1,608 | |
| 1999 | 186 | -7 | 1,656 | |
| 1998 | 179 | -11 | 1,706 | |
| 1997 | 168 | +5 | 1,837 | |
| 1996 | 173 | -1 | 1,807 | |
| 1995 | 172 | +26 | 1,749 | |
| 1994 | 198 | -15 | 1,503 | |
| 1993 | 183 | +7 | 1,590 | |
| 1992 | 190 | +1 | 1,596 | |
| 1991 | 191 | +7 | 1,568 | |
| 1990 | 198 | -6 | 1,490 | |
| 1989 | 192 | +15 | 1,412 | |
| 1988 | 207 | -1 | 1,267 | |
| 1987 | 206 | -11 | 1,304 | |
| 1986 | 195 | -2 | 1,331 | |
| 1985 | 193 | +5 | 1,395 | |
| 1984 | 198 | -3 | 1,351 | |
| 1983 | 195 | -5 | 1,352 | |
| 1982 | 190 | -9 | 1,439 | |
| 1981 | 181 | +10 | 1,528 | |
| 1980 | 191 | +12 | 1,404 | |
| 1979 | 203 | +11 | 1,310 | |
| 1978 | 214 | -7 | 1,199 | |
| 1977 | 207 | -25 | 1,230 | |
| 1976 | 182 | -2 | 1,409 | |
| 1975 | 180 | -13 | 1,446 | |
| 1974 | 167 | +9 | 1,610 | |
| 1973 | 176 | +29 | 1,567 | |
| 1972 | 205 | +33 | 1,360 | |
| 1971 | 238 | +14 | 1,248 | |
| 1970 | 252 | +7 | 1,224 | |
| 1969 | 259 | +15 | 1,118 | |
| 1968 | 274 | +8 | 991 | |
| 1967 | 282 | +33 | 902 | |
| 1966 | 315 | +1 | 795 | |
| 1965 | 316 | -25 | 815 | |
| 1964 | 291 | 0 | 994 | |
| 1963 | 291 | -1 | 1,001 | |
| 1962 | 290 | -27 | 996 | |
| 1961 | 263 | -4 | 1,162 | |
| 1960 | 259 | -38 | 1,192 | |
| 1959 | 221 | -15 | 1,420 | |
| 1958 | 206 | -2 | 1,582 | |
| 1957 | 204 | -18 | 1,662 | |
| 1956 | 186 | -36 | 1,914 | |
| 1955 | 150 | -5 | 2,412 | |
| 1954 | 145 | -19 | 2,514 | |
| 1953 | 126 | -15 | 2,858 | |
| 1952 | 111 | +12 | 3,383 | |
| 1951 | 123 | +3 | 2,861 | |
| 1950 | 126 | +1 | 2,536 | |
| 1949 | 127 | -5 | 2,518 | |
| 1948 | 122 | 0 | 2,624 | |
| 1947 | 122 | +1 | 2,763 | |
| 1946 | 123 | +4 | 2,307 | |
| 1945 | 127 | -7 | 1,909 | |
| 1944 | 120 | +39 | 2,221 | |
| 1943 | 159 | +12 | 1,585 | |
| 1942 | 171 | +14 | 1,360 | |
| 1941 | 185 | +20 | 1,018 | |
| 1940 | 205 | -8 | 861 | |
| 1939 | 197 | +11 | 902 | |
| 1938 | 208 | +2 | 837 | |
| 1937 | 210 | -3 | 795 | |
| 1936 | 207 | +26 | 792 | |
| 1935 | 233 | +41 | 719 | |
| 1934 | 274 | +27 | 500 | |
| 1933 | 301 | +47 | 411 | |
| 1932 | 348 | -18 | 330 | |
| 1931 | 330 | +36 | 374 | |
| 1930 | 366 | +14 | 337 | |
| 1929 | 380 | -31 | 312 | |
| 1928 | 349 | +8 | 376 | |
| 1927 | 357 | -19 | 361 | |
| 1926 | 338 | +11 | 386 | |
| 1925 | 349 | +1 | 376 | |
| 1924 | 350 | +2 | 380 | |
| 1923 | 352 | -27 | 356 | |
| 1922 | 325 | -4 | 400 | |
| 1921 | 321 | +8 | 419 | |
| 1920 | 329 | +10 | 389 | |
| 1919 | 339 | -30 | 355 | |
| 1918 | 309 | +27 | 428 | |
| 1917 | 336 | -16 | 342 | |
| 1916 | 320 | -25 | 361 | |
| 1915 | 295 | +14 | 387 | |
| 1914 | 309 | +2 | 286 | |
| 1913 | 311 | -10 | 235 | |
| 1912 | 301 | -8 | 224 | |
| 1911 | 293 | +42 | 178 | |
| 1910 | 335 | -45 | 137 | |
| 1909 | 290 | +16 | 155 | |
| 1908 | 306 | -16 | 134 | |
| 1907 | 290 | -12 | 143 | |
| 1906 | 278 | +26 | 142 | |
| 1905 | 304 | +24 | 122 | |
| 1904 | 328 | -12 | 100 | |
| 1903 | 316 | +2 | 98 | |
| 1902 | 318 | +13 | 97 | |
| 1901 | 331 | -36 | 84 | |
| 1900 | 295 | +21 | 125 | |
| 1899 | 316 | -6 | 89 | |
| 1898 | 310 | +6 | 103 | |
| 1897 | 316 | -12 | 85 | |
| 1896 | 304 | -15 | 92 | |
| 1895 | 289 | -26 | 96 | |
| 1894 | 263 | +18 | 108 | |
| 1893 | 281 | -9 | 89 | |
| 1892 | 272 | +4 | 95 | |
| 1891 | 276 | -18 | 81 | |
| 1890 | 258 | -10 | 95 | |
| 1889 | 248 | +9 | 88 | |
| 1888 | 257 | -14 | 81 | |
| 1887 | 243 | +27 | 74 | |
| 1886 | 270 | -23 | 59 | |
| 1885 | 247 | +29 | 67 | |
| 1884 | 276 | -41 | 50 | |
| 1883 | 235 | +12 | 58 | |
| 1882 | 247 | -38 | 49 | |
| 1881 | 209 | +14 | 52 | |
| 1880 | 223 | 48 |
