1990

2.0

1975

6.5

1986

5.3

2004

6.7

1996

4.3

1981

0.0

2013

7.1

1972

5.9

1990

10.0

1987

5.3

1997

6.8

1976

6.0

2013

6.5

1998

6.5

2006

7.3