| x | y |
|---|---|
| number | number |
| years | ‰ |
| 1948 | |
| 1949 | |
| 1950 | |
| 1951 | |
| 1952 | |
| 1953 | |
| 1954 | 6.9 |
| 1955 | |
| 1956 | |
| 1957 | |
| 1958 | |
| 1959 | 7 |
| 1960 | |
| 1961 | |
| 1962 | |
| 1963 | |
| 1964 | 7.21 |
| 1965 | |
| 1966 | |
| 1967 | 7.22 |
| 1968 | |
| 1969 | 6.86 |
| 1970 | |
| 1971 | 6.09 |
| 1972 | 6 |
| 1973 | |
| 1974 | 6.18 |
| 1975 | |
| 1976 | |
| 1977 | |
| 1978 | |
| 1979 | 5.14 |
| 1980 | 4.92 |
| 1981 | 4.51 |
| 1982 | |
| 1983 | |
| 1984 | 4.88 |
| 1985 | 4.66 |
| 1986 | 4.42 |
| 1987 | 4.39 |
| 1988 | 4.07 |
| 1989 | 3.78 |
| 1990 | 3.36 |
| 1991 | 3.35 |
| 1992 | 3.28 |
| 1993 | 3.25 |
| 1994 | 3.09 |
| 1995 | 2.9 |
| 1996 | 2.67 |
| 1997 | 2.51 |
| 1998 | 2.38 |
| 1999 | 2.23 |
| 2000 | 2.09 |
| 2001 | 2.08 |
| 2002 | 2.05 |
| 2003 | 2 |
| 2004 | 2.06 |
| 2005 | 2.02 |
| 2006 | 2.04 |
| 2007 | 2.03 |
| 2008 | 2.04 |
| 2009 | 2.06 |
| 2010 | 2.05 |
| 2011 | 2.13 |
| 2012 | 2.15 |
| 2013 | 2.38 |
| 2014 | 2.4 |
| 2015 | 2.42 |
| 2016 | 2.37 |
| 2017 | 2.29 |
| 2018 | 2.23 |
| 2019 | 2.17 |
| 2020 | 1.96 |
| 2021 | 1.82 |
| 2022 | 1.7 |
| 2023 | 1.56 |
| 2024 | 1.45 |
Data available underCreative Commons Zero.
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