| 年份 | 保加利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 5.8 |
| 2020 | 5.9 |
| 2019 | 6.1 |
| 2018 | 6.3 |
| 2017 | 6.6 |
| 2016 | 7 |
| 2015 | 7.3 |
| 2014 | 7.8 |
| 2013 | 8.3 |
| 2012 | 8.8 |
| 2011 | 9.3 |
| 2010 | 9.7 |
| 2009 | 10 |
| 2008 | 10.2 |
| 2007 | 10.6 |
| 2006 | 11.2 |
| 2005 | 11.9 |
| 2004 | 12.7 |
| 2003 | 13.5 |
| 2002 | 14.3 |
| 2001 | 14.9 |
| 2000 | 15.5 |
| 1999 | 16.1 |
| 1998 | 16.8 |
| 1997 | 17.2 |
| 1996 | 17.1 |
| 1995 | 16.9 |
| 1994 | 16.9 |
| 1993 | 17 |
| 1992 | 16.9 |
| 1991 | 16.6 |
| 1990 | 16.1 |
| 1989 | 15.7 |
| 1988 | 15.5 |
| 1987 | 15.8 |
| 1986 | 16.5 |
| 1985 | 17.5 |
| 1984 | 18.3 |
| 1983 | 19 |
| 1982 | 19.6 |
| 1981 | 20.1 |
| 1980 | 20.8 |
| 1979 | 21.8 |
| 1978 | 22.9 |
| 1977 | 23.8 |
| 1976 | 24.5 |
| 1975 | 25.1 |
| 1974 | 25.5 |
| 1973 | 25.9 |
| 1972 | 26.6 |
| 1971 | 27.4 |
| 1970 | 28.5 |
| 1969 | 30 |
| 1968 | 31.8 |
| 1967 | 33 |
| 1966 | 33.5 |
| 1965 | 33.8 |
| 1964 | 35 |
| 1963 | 37 |
| 1962 | 40.2 |
| 1961 | 44.8 |
| 1960 | 50.9 |