1910    26.260
1911    33.500
1912    36.580
1913    24.160
1914    14.220
1915    27.700
1916    52.700
1917    41.820
1918     8.800
1919    12.540
1920    12.400
1921    19.100
1922    18.020
1923    19.580
1924    29.280
1925    14.760
1926    11.620
1927    31.080
1928    16.260
1929    29.320
1930     7.100
1931    41.660
1932     9.100
1933    17.300
1934    60.380
1935    13.520
1936    21.540
1937    24.380
1938    14.620
1939    27.580
1940    17.260
1941    21.900
1942    12.920
1943     7.360
1944    18.380
1945    11.400
1946    14.300
1947     8.900
1948     9.740
1949     9.520
1950    31.900
1951    43.540
1952    13.020
1953    21.160
1954    20.660
1955    22.060
1956    10.560
1957     9.980
1958     8.500
1959     4.520
1960    12.720
1961    16.480
1962     4.620
1963     7.800
1964    15.480
1965    13.020
1966     8.700
1967     7.180
1968    13.260
1969     9.160
1970     8.140
1971    10.800
1972    12.960
1973    13.660
1974     5.780
1975    16.620
1976    16.040
1977    10.820
1978    29.520
1979    14.780
1980    10.520
1981    33.260
1982    23.640
1983    18.280
1984    16.420
1985    21.600
1986    18.340
1987    37.880
1988    34.660
1989    14.700
1990    18.280
1991    14.360
1992    14.440
1993    40.940
1994    18.960
1995    23.440
1996    32.400
1997    13.420
1998    37.780
1999    36.920
2000    15.700
2001    33.080
2002    11.860
2003    15.100
2004    13.520
2005    28.280
2006    36.160
2007    40.820
2008    18.920
2009    18.620
2010    30.340
2011    26.340
2012    49.120