1981

7.4

1986

6.3

1933

4.2

2008

6.7

1983

5.5

2002

5.6

2000

5.5

2014

4.8

2015

6.4

2016

6.1

1989

5.9

2004

5.2

1978

4.8

1962

6.9

1964

7.1

1971

6.4

2005

6.8

2001

6.4

1984

6.0

2014

5.9