annee entrees
1947 10.4
1948 9.8
1949 9.3
1950 8.9
1951 8.9
1952 8.5
1953 8.7
1954 8.9
1955 9.1
1956 9.1
1957 9.3
1958 8.3
1959 7.9
1960 7.8
1961 7.2
1962 6.7
1963 6.1
1964 5.7
1965 5.3
1966 4.8
1967 4.3
1968 4.1
1969 3.7
1970 3.6
1971 3.5
1972 3.6
1973 3.4
1974 3.4
1975 3.5
1976 3.4
1977 3.2
1978 3.4
1979 3.3
1980 3.3
1981 3.5
1982 3.7
1983 3.6
1984 3.5
1985 3.2
1986 3
1987 2.5
1988 2.2
1989 2.1
1990 2.2
1991 2.1
1992 2
1993 2.3
1994 2.2
1995 2.3
1996 2.4
1997 2.6
1998 2.9
1999 2.7
2000 2.8
2001 3.2
2002 3.1
2003 2.9
2004 3.2
2005 2.9
2006 3.1
2007 2.8
2008 3
2009 3.1
2010 3.2
2011 3.3
2012 3.1
2013 2.9
2014 3.2
2015 3.2
2016 3.3