2003

7.2

2017

6.4

2021

5.5

1977

5.5

1974

6.4

2015

7.5

1983

5.5

2000

8.1

1983

5.7

2013

6.8

1981

7.1

2007

6.1

2005

7.7

1954

8.5

2004

7.9

1989

6.6

2002

6.7

1980

5.3

2004

7.3

1990

6.0