2007

6.5

2003

6.0

2002

5.9

2000

7.2

2001

7.8

1997

7.2

1971

6.7

1973

6.8

1993

5.3

2019

4.0

1994

7.6

1992

5.8

1985

6.5

2003

5.5

1982

7.1

2014

5.1

1974

4.9

2006

5.5

1959

4.8

2023

6.5