1971

6.4

1983

6.1

2022

5.6

1979

6.2

2003

5.7

1987

6.5

2019

7.7

2010

6.6

2013

5.9

1995

5.6

2005

5.2

1964

7.3

1942

7.0

1977

6.7

2015

6.0

2004

6.5

2000

6.4

1994

6.2

2002

6.3

1997

7.4