| 年份 | 保加利亚 |
|---|---|
| 2023 | - |
| 2022 | 8.33751 |
| 2021 | 8.08254 |
| 2020 | 7.89275 |
| 2019 | 7.75477 |
| 2018 | 7.68149 |
| 2017 | 7.59763 |
| 2016 | 7.40273 |
| 2015 | 7.16389 |
| 2014 | 6.94398 |
| 2013 | 6.77197 |
| 2012 | 6.76061 |
| 2011 | 6.92942 |
| 2010 | 7.11092 |
| 2009 | 7.17743 |
| 2008 | 7.15858 |
| 2007 | 7.16091 |
| 2006 | 7.17099 |
| 2005 | 7.16623 |
| 2004 | 7.17669 |
| 2003 | 7.2096 |
| 2002 | 7.21155 |
| 2001 | 7.15167 |
| 2000 | 7.09135 |
| 1999 | 7.08525 |
| 1998 | 7.10223 |
| 1997 | 7.11554 |
| 1996 | 7.13405 |
| 1995 | 7.09734 |
| 1994 | 6.93854 |
| 1993 | 6.68218 |
| 1992 | 6.39824 |
| 1991 | 6.12436 |
| 1990 | 5.88849 |
| 1989 | 5.7387 |
| 1988 | 5.67798 |
| 1987 | 5.69515 |
| 1986 | 5.78476 |
| 1985 | 5.9504 |
| 1984 | 6.18869 |
| 1983 | 6.45094 |
| 1982 | 6.67767 |
| 1981 | 6.84211 |
| 1980 | 6.93579 |
| 1979 | 6.96697 |
| 1978 | 6.96831 |
| 1977 | 6.98471 |
| 1976 | 7.04332 |
| 1975 | 7.14243 |
| 1974 | 7.26544 |
| 1973 | 7.36062 |
| 1972 | 7.37465 |
| 1971 | 7.31225 |
| 1970 | 7.16519 |
| 1969 | 6.865 |
| 1968 | 6.41692 |
| 1967 | 5.91135 |
| 1966 | 5.43113 |
| 1965 | 5.05757 |
| 1964 | 4.91481 |
| 1963 | 5.03015 |
| 1962 | 5.26772 |
| 1961 | 5.54058 |
| 1960 | 5.8255 |