1979

2.0

2005

5.3

2007

10.0

2007

10.0

2002

6.8

1983

5.2

2001

5.1

1973

7.1

2005

7.0

2003

5.9

1985

5.8

1986

6.1

1982

5.7

1987

6.9

1975

5.5

2019

6.9

1965

8.1

2006

6.3

2020

6.5

1996

6.5