1989

5.1

2007

7.1

2016

5.9

2001

6.4

2015

5.7

2001

6.4

1987

7.6

1931

6.9

1996

6.7

1953

7.7

2011

7.1

2011

6.0

2001

7.5

1985

6.4

2009

7.4

2013

5.8

1995

6.5

1927

7.3

1975

7.2

2007

6.4