Tabella dei dati
| 1951 | 140 mln | 1976 | 3,65 mld | 2001 | 8,38 mld |
| 1952 | 172 mln | 1977 | 3,18 mld | 2002 | 7,92 mld |
| 1953 | 75,6 mln | 1978 | 3,12 mld | 2003 | 8,13 mld |
| 1954 | 57,6 mln | 1979 | 3,39 mld | 2004 | 8,57 mld |
| 1955 | 84,7 mln | 1980 | 4,12 mld | 2005 | 8,81 mld |
| 1956 | 174 mln | 1981 | 4,7 mld | 2006 | 9,23 mld |
| 1957 | 164 mln | 1982 | 4,52 mld | 2007 | 11,2 mld |
| 1958 | 159 mln | 1983 | 4,27 mld | 2008 | 13,6 mld |
| 1959 | 171 mln | 1984 | 4,21 mld | 2009 | 12,6 mld |
| 1960 | 190 mln | 1985 | 4 mld | 2010 | 13,7 mld |
| 1961 | 242 mln | 1986 | 4,39 mld | 2011 | 14,5 mld |
| 1962 | 211 mln | 1987 | 6 mld | 2012 | 14 mld |
| 1963 | 259 mln | 1988 | 7 mld | 2013 | 15,7 mld |
| 1964 | 279 mln | 1989 | 5,55 mld | 2014 | 17,2 mld |
| 1965 | 314 mln | 1990 | 6,53 mld | 2015 | 16 mld |
| 1966 | 376 mln | 1991 | 9,34 mld | 2016 | 16,6 mld |
| 1967 | 606 mln | 1992 | 7,31 mld | 2017 | 18,7 mld |
| 1968 | 690 mln | 1993 | 7,75 mld | 2018 | 19,3 mld |
| 1969 | 872 mln | 1994 | 7,77 mld | 2019 | 19,8 mld |
| 1970 | 1,26 mld | 1995 | 7,83 mld | 2020 | 21 mld |
| 1971 | 1,27 mld | 1996 | 8,38 mld | 2021 | 23,6 mld |
| 1972 | 1,46 mld | 1997 | 8,46 mld | 2022 | 22,8 mld |
| 1973 | 2,57 mld | 1998 | 7,98 mld | 2023 | 27,1 mld |
| 1974 | 3,48 mld | 1999 | 7,54 mld | 2024 | 45,9 mld |
| 1975 | 3,76 mld | 2000 | 8,21 mld | 2025 | 48,3 mld |
Tabella dei dati
| 1960 | 7,5% | 1982 | 18,4% | 2004 | 6,1% |
| 1961 | 7,9% | 1983 | 15,5% | 2005 | 6% |
| 1962 | 9,2% | 1984 | 16,2% | 2006 | 5,8% |
| 1963 | 9,8% | 1985 | 16,6% | 2007 | 6,1% |
| 1964 | 9% | 1986 | 14,8% | 2008 | 6,2% |
| 1965 | 8,6% | 1987 | 16,9% | 2009 | 5,9% |
| 1966 | 9,4% | 1988 | 15,9% | 2010 | 5,7% |
| 1967 | 15,4% | 1989 | 12,4% | 2011 | 5,4% |
| 1968 | 17,4% | 1990 | 12,4% | 2012 | 5,3% |
| 1969 | 19,1% | 1991 | 15,6% | 2013 | 5,3% |
| 1970 | 23,4% | 1992 | 10,9% | 2014 | 5,5% |
| 1971 | 22,8% | 1993 | 11,5% | 2015 | 5,3% |
| 1972 | 20,4% | 1994 | 10,1% | 2016 | 5,2% |
| 1973 | 27,9% | 1995 | 7,4% | 2017 | 5,3% |
| 1974 | 27,7% | 1996 | 7,3% | 2018 | 5,1% |
| 1975 | 30,5% | 1997 | 7,1% | 2019 | 5% |
| 1976 | 29,2% | 1998 | 6,6% | 2020 | 5,1% |
| 1977 | 23,1% | 1999 | 6,2% | 2021 | 4,8% |
| 1978 | 22,9% | 2000 | 6% | 2022 | 4,3% |
| 1979 | 19,4% | 2001 | 6,2% | 2023 | 5,3% |
| 1980 | 18,9% | 2002 | 6,3% | 2024 | 8,5% |
| 1981 | 20,3% | 2003 | 6,2% | 2025 | 7,8% |