| 年份 | 保加利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 6.3 |
| 2020 | 6.5 |
| 2019 | 6.7 |
| 2018 | 7 |
| 2017 | 7.3 |
| 2016 | 7.7 |
| 2015 | 8.1 |
| 2014 | 8.7 |
| 2013 | 9.2 |
| 2012 | 9.8 |
| 2011 | 10.4 |
| 2010 | 10.8 |
| 2009 | 11.1 |
| 2008 | 11.4 |
| 2007 | 11.8 |
| 2006 | 12.4 |
| 2005 | 13.3 |
| 2004 | 14.2 |
| 2003 | 15.2 |
| 2002 | 16 |
| 2001 | 16.7 |
| 2000 | 17.4 |
| 1999 | 18.2 |
| 1998 | 19 |
| 1997 | 19.4 |
| 1996 | 19.3 |
| 1995 | 19.1 |
| 1994 | 19.1 |
| 1993 | 19.3 |
| 1992 | 19.2 |
| 1991 | 18.9 |
| 1990 | 18.4 |
| 1989 | 17.9 |
| 1988 | 17.7 |
| 1987 | 17.9 |
| 1986 | 18.7 |
| 1985 | 19.8 |
| 1984 | 20.7 |
| 1983 | 21.5 |
| 1982 | 22.2 |
| 1981 | 22.9 |
| 1980 | 23.8 |
| 1979 | 24.9 |
| 1978 | 26.1 |
| 1977 | 27.2 |
| 1976 | 28 |
| 1975 | 28.6 |
| 1974 | 29 |
| 1973 | 29.5 |
| 1972 | 30.2 |
| 1971 | 31.1 |
| 1970 | 32.3 |
| 1969 | 33.9 |
| 1968 | 35.6 |
| 1967 | 36.7 |
| 1966 | 37.1 |
| 1965 | 37.4 |
| 1964 | 38.5 |
| 1963 | 40.7 |
| 1962 | 44.2 |
| 1961 | 49 |
| 1960 | 55.4 |