1991

2.7

2006

6.6

2014

6.6

1960

6.9

1975

6.6

2006

5.1

2003

6.0

2014

6.7

2011

6.2

1978

7.5

1982

6.7

1984

5.7

1953

4.6

2007

7.1

1991

6.5

2017

7.4

1987

6.8

1984

5.7

2014

4.1

1918

0.0