| 年份 | 保加利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 6.8 |
| 2020 | 7 |
| 2019 | 7.3 |
| 2018 | 7.6 |
| 2017 | 8 |
| 2016 | 8.4 |
| 2015 | 8.9 |
| 2014 | 9.5 |
| 2013 | 10.2 |
| 2012 | 10.8 |
| 2011 | 11.5 |
| 2010 | 11.9 |
| 2009 | 12.2 |
| 2008 | 12.5 |
| 2007 | 12.9 |
| 2006 | 13.6 |
| 2005 | 14.6 |
| 2004 | 15.7 |
| 2003 | 16.7 |
| 2002 | 17.6 |
| 2001 | 18.4 |
| 2000 | 19.3 |
| 1999 | 20.2 |
| 1998 | 21.1 |
| 1997 | 21.5 |
| 1996 | 21.5 |
| 1995 | 21.2 |
| 1994 | 21.2 |
| 1993 | 21.4 |
| 1992 | 21.4 |
| 1991 | 21.1 |
| 1990 | 20.5 |
| 1989 | 20 |
| 1988 | 19.7 |
| 1987 | 20 |
| 1986 | 20.8 |
| 1985 | 21.9 |
| 1984 | 23 |
| 1983 | 23.9 |
| 1982 | 24.7 |
| 1981 | 25.5 |
| 1980 | 26.6 |
| 1979 | 27.8 |
| 1978 | 29.2 |
| 1977 | 30.5 |
| 1976 | 31.4 |
| 1975 | 31.9 |
| 1974 | 32.4 |
| 1973 | 32.9 |
| 1972 | 33.6 |
| 1971 | 34.5 |
| 1970 | 36 |
| 1969 | 37.7 |
| 1968 | 39.2 |
| 1967 | 40.3 |
| 1966 | 40.5 |
| 1965 | 40.9 |
| 1964 | 41.9 |
| 1963 | 44.3 |
| 1962 | 47.9 |
| 1961 | 53 |
| 1960 | 59.7 |