| 年份 | 保加利亚 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 1.3729 |
| 2020 | 1.40015 |
| 2019 | 1.40936 |
| 2018 | 1.40936 |
| 2017 | 1.36413 |
| 2016 | 1.29882 |
| 2015 | 1.22973 |
| 2014 | 1.16986 |
| 2013 | 1.24355 |
| 2012 | 1.46463 |
| 2011 | 1.47384 |
| 2010 | 1.51069 |
| 2009 | 1.5199 |
| 2008 | 1.69413 |
| 2007 | 1.74017 |
| 2006 | 1.67541 |
| 2005 | 1.73049 |
| 2004 | 1.94005 |
| 2003 | 1.96745 |
| 2002 | 2.09559 |
| 2001 | 2.21459 |
| 2000 | 2.27786 |
| 1999 | 2.54 |
| 1998 | 2.53096 |
| 1997 | 1.79879 |
| 1996 | 1.79879 |
| 1995 | 1.84398 |
| 1994 | 1.95245 |
| 1993 | 2.23267 |
| 1992 | 2.55808 |
| 1991 | 2.69366 |
| 1990 | 2.71174 |
| 1989 | 2.69366 |
| 1988 | 2.71174 |
| 1987 | 2.76598 |
| 1986 | 2.83829 |
| 1985 | 2.92868 |
| 1984 | 2.96484 |
| 1983 | 2.97388 |
| 1982 | 3.00099 |
| 1981 | 3.09139 |
| 1980 | 3.1637 |
| 1979 | 3.22697 |
| 1978 | 3.27217 |
| 1977 | 3.39872 |
| 1976 | 3.49815 |
| 1975 | 3.48911 |
| 1974 | 3.52526 |
| 1973 | 3.45295 |
| 1972 | 3.45295 |
| 1971 | 3.47103 |
| 1970 | 3.48007 |
| 1969 | 3.58854 |
| 1968 | 3.65181 |
| 1967 | 3.68797 |
| 1966 | 3.59758 |
| 1965 | 3.5795 |
| 1964 | 3.56142 |
| 1963 | 3.55238 |
| 1962 | 3.47103 |
| 1961 | 3.31736 |
| 1960 | - |