Ik heb zojuist hetzelfde gedaan maar dan >=28 en krijg het volgende lijstje met 30-jarig gemiddelde vanaf 1980.
| Jaar | Uren >=28 | Gem |
| 1951 | 0 | |
| 1952 | 53 | |
| 1953 | 33 | |
| 1954 | 26 | |
| 1955 | 25 | |
| 1956 | 4 | |
| 1957 | 86 | |
| 1958 | 10 | |
| 1959 | 97 | |
| 1960 | 10 | |
| 1961 | 51 | |
| 1962 | 2 | |
| 1963 | 13 | |
| 1964 | 74 | |
| 1965 | 2 | |
| 1966 | 22 | |
| 1967 | 25 | |
| 1968 | 23 | |
| 1969 | 63 | |
| 1970 | 17 | |
| 1971 | 20 | |
| 1972 | 23 | |
| 1973 | 76 | |
| 1974 | 6 | |
| 1975 | 71 | |
| 1976 | 209 | |
| 1977 | 8 | |
| 1978 | 18 | |
| 1979 | 8 | |
| 1980 | 17 | 36,4 |
| 1981 | 25 | 37,23333 |
| 1982 | 59 | 37,43333 |
| 1983 | 85 | 39,16667 |
| 1984 | 40 | 39,63333 |
| 1985 | 18 | 39,4 |
| 1986 | 33 | 40,36667 |
| 1987 | 19 | 38,13333 |
| 1988 | 3 | 37,9 |
| 1989 | 55 | 36,5 |
| 1990 | 91 | 39,2 |
| 1991 | 76 | 40,03333 |
| 1992 | 62 | 42,03333 |
| 1993 | 15 | 42,1 |
| 1994 | 135 | 44,13333 |
| 1995 | 169 | 49,7 |
| 1996 | 45 | 50,46667 |
| 1997 | 78 | 52,23333 |
| 1998 | 74 | 53,93333 |
| 1999 | 64 | 53,96667 |
| 2000 | 46 | 54,93333 |
| 2001 | 78 | 56,86667 |
| 2002 | 68 | 58,36667 |
| 2003 | 121 | 59,86667 |
| 2004 | 46 | 61,2 |
| 2005 | 83 | 61,6 |
| 2006 | 169 | 60,26667 |
| 2007 | 20 | 60,66667 |
| 2008 | 20 | 60,73333 |
| 2009 | 51 | 62,16667 |
| 2010 | 98 | 64,86667 |
| 2011 | 39 | 65,33333 |
| 2012 | 55 | 65,2 |
| 2013 | 89 | 65,33333 |
| 2014 | 42 | 65,4 |
| 2015 | 104 | 68,26667 |
| 2016 | 88 | 70,1 |
| 2017 | 76 | 72 |
| 2018 | 175 | 77,73333 |
| 2019 | 156 | 81,1 |