2003

6.3

2008

6.8

2016

6.2

1990

6.9

2004

5.9

1998

6.6

2000

5.3

2003

5.7

1996

6.8

2001

7.7

1981

5.8

1996

7.3

1985

6.2

2004

6.2

1985

6.7

1986

6.9

1997

6.1

2006

4.4

2001

7.0

1965

5.9