1977

5.5

2003

6.4

1981

6.2

1986

7.4

1996

3.3

2004

3.7

1974

7.1

0.0

1995

6.6

2007

6.3

1983

6.9

2009

2.9

2021

5.8

2018

5.9

2014

7.9

1979

5.0

1997

5.7

2002

6.4

1991

6.1

1982

6.3