2016

6.7

1972

4.5

1994

5.2

1985

7.4

1992

7.3

1982

6.4

1990

6.0

2010

7.0

1998

4.8

1993

6.8

1970

6.3

1993

5.1

1985

5.3

1968

7.0

1987

7.8

1995

6.8

1983

8.7

1979

6.0

1979

8.1

2013

5.3