1958

7.2

1980

6.3

1974

7.5

1970

5.8

2005

6.7

2008

6.2

2008

6.5

1982

6.0

2014

6.6

1987

5.5

1971

6.2

1997

6.3

1998

6.1

1985

6.6

1953

6.8

2002

7.6

1998

5.4

1997

6.1

2028

0.0

2015

5.9