1984

7.1

2016

5.9

1993

5.8

1986

6.8

2016

6.3

2011

5.5

1986

6.2

2013

8.1

1998

6.1

2008

6.9

2002

7.5

1966

6.3

1991

5.7

2015

7.8

1999

5.1

1980

6.7

1987

7.1

1989

6.2

1988

5.7

1957

7.2