2016

6.5

1964

7.9

1971

6.4

1981

5.1

1987

7.7

1986

7.1

1968

5.7

1969

6.1

1974

6.2

1976

7.5

1980

10.0

1991

7.7

1980

3.9

1985

7.5

1979

5.6

2002

5.6