1910    13.720
1911    25.120
1912    23.700
1913    20.140
1914    26.520
1915    10.140
1916    35.220
1917    16.900
1918    30.580
1919    20.260
1920    18.440
1921    14.740
1922    15.320
1923    17.240
1924    16.140
1925    11.300
1926     9.080
1927     8.580
1928    12.860
1929    18.400
1930    27.380
1931    19.820
1932    27.460
1933    26.780
1934    19.860
1935    16.820
1936    13.320
1937    44.280
1938     7.600
1939    12.600
1940    31.520
1941    10.080
1942    14.980
1943    10.380
1944    15.600
1945     7.600
1946     8.420
1947    11.600
1948    18.500
1949    38.660
1950    32.240
1951     6.320
1952    20.680
1953    26.500
1954    13.140
1955    13.440
1956    18.940
1957    18.220
1958    10.160
1959     7.420
1960     8.280
1961    17.160
1962    12.700
1963    25.560
1964    14.440
1965    10.940
1966    14.800
1967    11.620
1968     5.260
1969    19.240
1970    18.360
1971     7.860
1972     7.440
1973    13.060
1974    18.020
1975     7.140
1976    11.140
1977    30.440
1978    31.640
1979    40.220
1980    11.700
1981    24.620
1982    18.900
1983    16.600
1984    13.540
1985    18.340
1986    23.320
1987     9.640
1988     7.920
1989    18.080
1990    30.980
1991    11.600
1992    17.820
1993    19.100
1994    23.100
1995    13.540
1996    13.840
1997    13.280
1998    22.780
1999    17.380
2000    13.720
2001     9.260
2002    17.640
2003    24.620
2004    11.480
2005    21.860
2006    37.800
2007    14.720
2008     8.800
2009    14.640
2010    15.820
2011    10.560
2012    24.300
2013    14.400