2005

6.2

2006

5.2

1980

4.8

2003

8.2

1999

6.8

1984

6.2

1985

7.8

2001

6.9

2019

3.8

1999

7.1

1975

3.8

1987

7.1

1994

7.4

1991

7.1

1990

6.8

1982

6.2

2017

5.3

2004

4.8

2008

5.3

1974

7.5