1975

6.7

1987

7.1

1966

7.1

1991

6.1

2003

5.8

2002

5.3

2005

6.3

1981

7.1

2008

6.6

1982

7.5

1979

5.6

2023

6.4

2009

6.3

1997

6.9

2016

4.6

1989

5.8

1994

3.7

1986

7.2

1993

6.1

1978

6.9