1990,6,5.9,5.5,5.3,5.2,5.4,5.6,5.5,5.6,5.5,5.9,6,5.6
1991,7.1,7.3,7.2,6.5,6.7,7,6.8,6.6,6.5,6.5,6.7,6.9,6.8
1992,8.1,8.2,7.8,7.2,7.3,8,7.7,7.4,7.3,6.9,7.1,7.1,7.5
1993,8,7.8,7.4,6.9,6.8,7.2,7,6.6,6.4,6.4,6.2,6.1,6.9
1994,7.3,7.1,6.8,6.2,5.9,6.2,6.2,5.9,5.6,5.4,5.3,5.1,6.1
1995,6.2,5.9,5.7,5.6,5.5,5.8,5.9,5.6,5.4,5.2,5.3,5.2,5.6
1996,6.3,6,5.8,5.4,5.4,5.5,5.6,5.1,5,4.9,5,5,5.4
1997,5.9,5.7,5.5,4.8,4.7,5.2,5,4.8,4.7,4.4,4.3,4.4,4.9
1998,5.2,5,5,4.1,4.2,4.7,4.7,4.5,4.4,4.2,4.1,4,4.5
1999,4.8,4.7,4.4,4.1,4,4.5,4.5,4.2,4.1,3.8,3.8,3.7,4.2
2000,4.5,4.4,4.3,3.7,3.8,4.1,4.2,4.1,3.8,3.6,3.7,3.7,4
2001,4.7,4.6,4.5,4.2,4.1,4.7,4.7,4.9,4.7,5,5.3,5.4,4.7
2002,6.3,6.1,6.1,5.7,5.5,6,5.9,5.7,5.4,5.3,5.6,5.7,5.8
2003,6.5,6.4,6.2,5.8,5.8,6.5,6.3,6,5.8,5.6,5.6,5.4,6
2004,6.3,6,6,5.4,5.3,5.8,5.7,5.4,5.1,5.1,5.2,5.1,5.5
2005,5.7,5.8,5.4,4.9,4.9,.,.,.,.,.,.,.,.