1958

4.8

1982

7.7

2006

4.6

1983

6.2

1975

5.8

1986

4.2

1994

5.6

1999

6.4

2009

6.6

1970

5.0

1969

7.0

2002

6.4

1998

7.0

1973

6.8

2007

6.2

1983

6.8

1999

6.4

2019

8.0

1978

4.2

2014

7.2