1971

4.8

2002

4.8

1970

4.8

1980

1.0

1969

2.8

1998

6.6

2004

6.3

1980

2.0

1976

2.0

1979

7.2

1972

2.4

1990

4.2

1995

3.3

1975

5.8

2015

2.5

1959

8.1

1997

6.8

2005

6.7

1977

2.0

1981

5.4