1961

7.2

2016

6.6

2017

6.9

2007

5.6

2018

6.2

0.0

1991

6.7

2002

6.9

1998

5.9

1970

7.1

1999

6.7

1995

6.9

1996

6.9

2014

6.0

1964

7.4

1978

6.6

1988

5.4

2008

6.0

1963

6.5

1983

4.6