1981

7.1

2007

7.9

1985

7.7

2005

0.0

2009

7.5

2015

7.5

2015

7.8

1997

7.4

1964

7.2

2002

7.4

2015

7.1

2007

7.7

1974

7.3

2004

7.8

1961

7.7

1975

7.4

2006

8.6

1993

5.1

2021

6.7

1960

0.0