1910    22.260
1911    18.040
1912    16.960
1913    14.500
1914    16.640
1915    36.940
1916    16.120
1917    27.400
1918    28.560
1919     7.100
1920    20.700
1921    17.740
1922     9.920
1923    15.280
1924    36.420
1925    42.280
1926    27.320
1927    24.260
1928     6.900
1929    15.660
1930     4.740
1931    41.140
1932     6.720
1933    12.180
1934    15.720
1935    17.080
1936    21.400
1937     6.300
1938    22.260
1939     9.280
1940    11.600
1941    28.120
1942    16.980
1943     8.540
1944    13.260
1945    13.400
1946    23.080
1947    28.180
1948     7.700
1949     6.640
1950    11.320
1951    16.620
1952    19.000
1953    16.840
1954    15.880
1955    36.440
1956    25.320
1957    30.360
1958    32.680
1959     4.920
1960    25.720
1961    10.660
1962     8.620
1963    36.900
1964    10.500
1965     7.860
1966    10.900
1967    31.480
1968    14.320
1969    17.900
1970     8.200
1971    24.300
1972    16.920
1973    29.520
1974    40.520
1975    19.980
1976     6.620
1977    22.580
1978     9.460
1979    14.620
1980    23.360
1981    12.140
1982     6.700
1983    38.440
1984    16.540
1985    20.340
1986    19.600
1987    29.180
1988    11.340
1989    11.880
1990    15.280
1991    31.140
1992    14.700
1993    35.360
1994     8.520
1995    20.360
1996    17.600
1997    19.780
1998    11.040
1999     9.960
2000    25.180
2001    11.220
2002    18.040
2003    12.000
2004    23.800
2005    10.620
2006    42.580
2007    30.480
2008    13.840
2009    15.260
2010    12.780
2011    40.860
2012    51.900