1900.0 6.1
1901.0 8.1
1902.0 4.9
1903.0 6.8
1904.0 6.2
1905.0 5.9
1906.0 7.1
1907.0 6.2
1908.0 6.1
1909.0 6.3
1910.0 7.2
1911.0 7.3
1912.0 5.2
1913.0 7.3
1914.0 7.3
1915.0 5.4
1916.0 5.4
1917.0 7.2
1918.0 4.6
1919.0 6.8
1920.0 6.5
1921.0 5.6
1922.0 5.4
1923.0 5.9
1924.0 7.2
1925.0 6.1
1926.0 6.4
1927.0 5.9
1928.0 5.8
1929.0 7.1
1930.0 6.0
1931.0 4.6
1932.0 5.8
1933.0 8.1
1934.0 8.6
1935.0 6.1
1936.0 5.6
1937.0 7.0
1938.0 8.1
1939.0 7.8
1940.0 4.9
1941.0 7.0
1942.0 6.1
1943.0 6.6
1944.0 6.5
1945.0 6.6
1946.0 7.2
1947.0 8.6
1948.0 6.7
1949.0 9.9
1950.0 6.3
1951.0 7.8
1952.0 3.9
1953.0 6.4
1954.0 6.0
1955.0 7.8
1956.0 7.0
1957.0 5.3
1958.0 8.4
1959.0 7.5
1960.0 6.8
1961.0 8.1
1962.0 5.8
1963.0 6.7
1964.0 6.1
1965.0 7.6
1966.0 6.2
1967.0 7.5
1968.0 7.5
1969.0 7.1
1970.0 5.9
1971.0 6.6
1972.0 5.4
1973.0 5.4
1974.0 6.9
1975.0 7.3
1976.0 4.5
1977.0 5.4
1978.0 4.9
1979.0 6.1
1980.0 7.4
1981.0 7.7
1982.0 7.2
1983.0 7.0
1984.0 5.7
1985.0 4.4
1986.0 4.1
1987.0 5.2
1988.0 8.0
1989.0 7.1
1990.0 5.7
1991.0 6.6
1992.0 6.9
1993.0 4.4
1994.0 5.7
1995.0 6.9
1996.0 5.6
1997.0 7.6
1998.0 8.2
1999.0 10.1
2000.0 7.0
2001.0 7.2
2002.0 8.3
2003.0 7.6
2004.0 7.8
2005.0 7.9
2006.0 10.3
2007.0 6.1
2008.0 6.8
2009.0 8.4
2010.0 6.5
2011.0 8.5
2012.0 6.3
2013.0 7.6
2014.0 8.5
2015.0 8.0
2016.0 10.5
2017.0 7.8
2018.0 7.9
2019.0 7.0