5.4%
1.0
2.0
3.0
4.0
5.0
6.0%
4.2%
1975
5.7%
1977
6.3%
1979
6.5%
1980
6.1%
1981
6.5%
1982
6.7%
1983
6.2%
1984
6.2%
1985
6.2%
1986
5.9%
1987
6.0%
1988
5.5%
1989
5.7%
1990
6.3%
1991
6.3%
1992
6.7%
1993
5.8%
1994
6.3%
1995
6.3%
1996
6.3%
1997
6.6%
1998
6.2%
1999
5.7%
2000
5.6%
2001
5.3%
2002
5.6%
2003
5.6%
2004
5.4%
2005
4.9%
2006
5.3%
2007
5.1%
2008
5.4%
2009
5.3%
2010
5.4%
2011
5.2%
2012
5.6%
2013
5.7%
2014
5.9%
2015
5.5%
2016
5.6%
2017
5.4%
2018
