| 年份 | 意大利 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 2 |
| 2020 | 2.2 |
| 2019 | 2.3 |
| 2018 | 2.5 |
| 2017 | 2.6 |
| 2016 | 2.7 |
| 2015 | 2.7 |
| 2014 | 2.8 |
| 2013 | 2.9 |
| 2012 | 2.9 |
| 2011 | 3 |
| 2010 | 3.1 |
| 2009 | 3.2 |
| 2008 | 3.2 |
| 2007 | 3.3 |
| 2006 | 3.4 |
| 2005 | 3.5 |
| 2004 | 3.6 |
| 2003 | 3.8 |
| 2002 | 3.9 |
| 2001 | 4.1 |
| 2000 | 4.4 |
| 1999 | 4.6 |
| 1998 | 4.9 |
| 1997 | 5.2 |
| 1996 | 5.5 |
| 1995 | 5.8 |
| 1994 | 6.1 |
| 1993 | 6.5 |
| 1992 | 6.9 |
| 1991 | 7.2 |
| 1990 | 7.5 |
| 1989 | 7.8 |
| 1988 | 8.1 |
| 1987 | 8.5 |
| 1986 | 8.8 |
| 1985 | 9.4 |
| 1984 | 9.9 |
| 1983 | 10.6 |
| 1982 | 11.3 |
| 1981 | 11.9 |
| 1980 | 12.5 |
| 1979 | 13.3 |
| 1978 | 14.1 |
| 1977 | 15.2 |
| 1976 | 16.5 |
| 1975 | 18.1 |
| 1974 | 19.8 |
| 1973 | 21.5 |
| 1972 | 23.3 |
| 1971 | 25 |
| 1970 | 26.4 |
| 1969 | 27.5 |
| 1968 | 28.5 |
| 1967 | 29.5 |
| 1966 | 30.5 |
| 1965 | 31.8 |
| 1964 | 33.7 |
| 1963 | 35.2 |
| 1962 | 37 |
| 1961 | 38.6 |
| 1960 | 40.3 |