| Year |
Value |
| 1909 |
20,764 |
| 1910 |
19,891 |
| 1911 |
19,559 |
| 1912 |
22,445 |
| 1913 |
21,957 |
| 1914 |
20,917 |
| 1915 |
19,578 |
| 1916 |
19,072 |
| 1917 |
20,897 |
| 1918 |
24,556 |
| 1919 |
21,848 |
| 1920 |
25,551 |
| 1921 |
25,445 |
| 1922 |
26,044 |
| 1923 |
25,700 |
| 1924 |
26,217 |
| 1925 |
27,583 |
| 1926 |
28,068 |
| 1927 |
28,272 |
| 1928 |
28,795 |
| 1929 |
29,430 |
| 1930 |
29,580 |
| 1931 |
29,736 |
| 1932 |
30,497 |
| 1933 |
30,512 |
| 1934 |
29,561 |
| 1935 |
30,373 |
| 1936 |
30,980 |
| 1937 |
31,520 |
| 1938 |
31,732 |
| 1939 |
32,583 |
| 1940 |
32,853 |
| 1941 |
33,722 |
| 1942 |
36,915 |
| 1943 |
41,698 |
| 1944 |
44,476 |
| 1945 |
45,634 |
| 1946 |
45,508 |
| 1947 |
44,314 |
| 1948 |
43,239 |
| 1949 |
43,517 |
| 1950 |
44,019 |
| 1951 |
44,880 |
| 1952 |
45,456 |
| 1953 |
45,384 |
| 1954 |
45,606 |
| 1955 |
46,616 |
| 1956 |
47,637 |
| 1957 |
48,051 |
| 1958 |
47,758 |
| 1959 |
47,438 |
| 1960 |
47,503 |
| 1961 |
46,775 |
| 1962 |
46,896 |
| 1963 |
47,337 |
| 1964 |
47,528 |
| 1965 |
47,601 |
| 1966 |
47,803 |
| 1967 |
44,875 |
| 1968 |
44,164 |
| 1969 |
43,215 |
| 1970 |
43,559 |
| 1971 |
43,159 |
| 1972 |
41,943 |
| 1973 |
40,239 |
| 1974 |
38,407 |
| 1975 |
37,683 |
| 1976 |
36,633 |
| 1977 |
35,319 |
| 1978 |
34,403 |
| 1979 |
33,519 |
| 1980 |
32,196 |
| 1981 |
31,283 |
| 1982 |
30,189 |
| 1983 |
29,713 |
| 1984 |
29,008 |
| 1985 |
28,469 |
| 1986 |
27,123 |
| 1987 |
26,303 |
| 1988 |
25,304 |
| 1989 |
23,386 |
| 1990 |
21,845 |
| 1991 |
21,263 |
| 1992 |
20,651 |
| 1993 |
19,875 |
| 1994 |
19,617 |
| 1995 |
19,008 |
| 1996 |
18,999 |
| 1997 |
18,669 |
| 1998 |
18,382 |
| 1999 |
18,686 |
| 2000 |
18,646 |
| 2001 |
18,180 |
| 2002 |
18,120 |
| 2003 |
17,993 |
| 2004 |
17,544 |
| 2005 |
16,922 |
|
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