1994

4.7

1964

7.3

2001

5.2

1932

7.3

1984

6.1

2004

6.0

1971

6.4

1982

7.5

2006

6.5

2009

5.3

1999

6.3

1989

5.7

1984

7.4

2004

7.3

1995

8.2

1983

6.6

1994

6.1

1968

6.8

2011

7.0

2020

7.5