1976

5.9

1992

6.0

2004

7.3

2008

6.1

2005

6.7

1995

5.5

2002

7.6

2017

7.8

1990

5.9

1984

6.6

1989

5.7

2001

7.1

2004

5.7

1979

6.1

2004

6.7

2014

6.5

2015

7.6

1997

6.6

1999

6.3

2004

7.2