1984

6.8

2005

6.2

2006

5.9

1933

4.5

2001

5.7

2015

3.7

1964

7.5

1974

6.4

2007

5.2

1999

7.5

1983

6.6

2014

7.5

1968

6.5

1986

7.2

1972

7.8

1997

6.1

1995

6.3

2003

7.4

1985

6.5

2017

5.1