| Year | Code | Year | Code | Year | Code | Year | Code | Year | Code | Year | Code | Code | Year | Code | Year | Code | Code | Year | Code |
| 1980 | A | 1986 | G | 1992 | N | 1998 | W | 2004 | 4 | 2010 | A | 2016 | G | 2022 | N | 2028 | W | 2034 | 4 |
| 1981 | B | 1987 | H | 1993 | P | 1999 | X | 2005 | 5 | 2011 | B | 2017 | H | 2023 | P | 2029 | X | 2035 | 5 |
| 1982 | C | 1988 | J | 1994 | R | 2000 | Y | 2006 | 6 | 2012 | C | 2018 | J | 2024 | R | 2030 | Y | 2036 | 6 |
| 1983 | D | 1989 | K | 1995 | S | 2001 | 1 | 2007 | 7 | 2013 | D | 2019 | K | 2025 | S | 2031 | 1 | 2037 | 7 |
| 1984 | E | 1990 | L | 1996 | T | 2002 | 2 | 2008 | 8 | 2014 | E | 2020 | L | 2026 | T | 2032 | 2 | 2038 | 8 |
| 1985 | F | 1991 | M | 1997 | V | 2003 | 3 | 2009 | 9 | 2015 | F | 2021 | M | 2027 | V | 2033 | 3 | 2039 | 9 |