1963

6.5

1981

7.2

2000

7.4

1991

6.9

2008

6.1

2005

6.5

2008

6.5

1973

7.6

2002

5.3

1995

7.9

2016

6.1

2003

5.9

1985

7.5

2001

6.6

1994

6.6

2003

6.1

2024

8.5

1999

6.1

1927

6.9

2014

6.3