1989

3.2

2004

5.6

1987

7.3

2007

5.9

2003

4.5

2002

6.2

2002

6.0

1963

7.5

2003

5.7

1976

6.7

2005

6.5

1973

6.9

1977

3.6

1982

3.0

1999

4.7

2002

3.4

2016

5.5

2005

5.2

1998

5.8

1999

6.8