1970

7.1

1976

7.0

1978

6.6

1988

5.4

2000

7.1

1972

5.8

2019

0.0

2018

4.5

1996

7.5

1970

7.1

1979

7.0

1994

8.5

1971

5.3

1986

6.7

2002

6.2

1976

6.0

1995

6.9

2013

6.0

1976

6.6

2003

5.6