1963

8.2

2019

5.6

2008

6.3

2013

5.9

2005

5.7

1996

5.4

5.8

1963

6.9

1982

4.0

2016

5.5

2014

7.0

1986

6.0

2004

4.0

2000

6.0

2013

6.5

1989

3.0

1970

6.0

1953

6.2

2009

4.8