1910    17.500
1911     9.340
1912    15.900
1913    28.560
1914    31.900
1915    48.840
1916    10.580
1917    21.280
1918    14.540
1919    10.360
1920    22.300
1921    22.380
1922    10.880
1923     4.960
1924    18.660
1925    13.100
1926     4.900
1927    51.280
1928    23.960
1929    22.880
1930    37.820
1931    24.860
1932    11.720
1933    27.220
1934    58.860
1935    13.540
1936    64.340
1937     9.880
1938     8.380
1939     5.260
1940     8.600
1941    19.240
1942    12.300
1943    26.620
1944    16.420
1945    18.800
1946    17.500
1947     6.220
1948     4.100
1949    20.500
1950    46.340
1951    18.140
1952    18.780
1953    33.100
1954    36.060
1955     9.980
1956     9.280
1957    12.580
1958    32.900
1959     5.940
1960     4.820
1961    14.540
1962     5.260
1963    16.420
1964    16.040
1965    11.480
1966    10.240
1967    29.880
1968     6.280
1969     8.120
1970     6.960
1971     1.940
1972    18.280
1973    23.280
1974    17.000
1975     7.740
1976    20.180
1977     8.080
1978     2.640
1979    22.480
1980    25.620
1981    18.640
1982    20.380
1983    28.200
1984    10.080
1985    22.780
1986     5.840
1987    17.120
1988    42.600
1989    16.960
1990    13.540
1991    21.540
1992    40.900
1993    28.020
1994     9.740
1995    20.340
1996    11.400
1997    18.320
1998    22.280
1999    15.820
2000    11.600
2001     5.420
2002    28.700
2003    17.940
2004    41.900
2005    26.120
2006    13.700
2007    23.460
2008    20.700
2009    28.840
2010    36.980
2011    30.260
2012    33.840