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| 1968 | + | 1 | = | 1969 |
| 1968 | + | 2 | = | 1970 |
| 1968 | + | 3 | = | 1971 |
| 1968 | + | 4 | = | 1972 |
| 1968 | + | 5 | = | 1973 |
| 1968 | + | 6 | = | 1974 |
| 1968 | + | 7 | = | 1975 |
| 1968 | + | 8 | = | 1976 |
| 1968 | + | 9 | = | 1977 |
| 1968 | + | 10 | = | 1978 |
| 1968 | + | 11 | = | 1979 |
| 1968 | + | 12 | = | 1980 |
| 1968 | + | 13 | = | 1981 |
| 1968 | + | 14 | = | 1982 |
| 1968 | + | 15 | = | 1983 |
| 1968 | + | 16 | = | 1984 |
| 1968 | + | 17 | = | 1985 |
| 1968 | + | 18 | = | 1986 |
| 1968 | + | 19 | = | 1987 |
| 1968 | + | 20 | = | 1988 |
| 1968 | + | 21 | = | 1989 |
| 1968 | + | 22 | = | 1990 |
| 1968 | + | 23 | = | 1991 |
| 1968 | + | 24 | = | 1992 |
| 1968 | + | 25 | = | 1993 |
| 1968 | + | 26 | = | 1994 |
| 1968 | + | 27 | = | 1995 |
| 1968 | + | 28 | = | 1996 |
| 1968 | + | 29 | = | 1997 |
| 1968 | + | 30 | = | 1998 |
| 1968 | + | 31 | = | 1999 |
| 1968 | + | 32 | = | 2000 |
| 1968 | + | 33 | = | 2001 |
| 1968 | + | 34 | = | 2002 |
| 1968 | + | 35 | = | 2003 |
| 1968 | + | 36 | = | 2004 |
| 1968 | + | 37 | = | 2005 |
| 1968 | + | 38 | = | 2006 |
| 1968 | + | 39 | = | 2007 |
| 1968 | + | 40 | = | 2008 |
| 1968 | + | 41 | = | 2009 |
| 1968 | + | 42 | = | 2010 |
| 1968 | + | 43 | = | 2011 |
| 1968 | + | 44 | = | 2012 |
| 1968 | + | 45 | = | 2013 |
| 1968 | + | 46 | = | 2014 |
| 1968 | + | 47 | = | 2015 |
| 1968 | + | 48 | = | 2016 |
| 1968 | + | 49 | = | 2017 |
| 1968 | + | 50 | = | 2018 |
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