1995

8.2

1999

7.4

1973

7.1

1986

6.2

1990

6.4

1985

6.7

2010

6.4

2005

6.2

1973

7.5

2009

6.1

2008

6.2

1992

7.0

2013

6.2

2009

6.2

2021

6.3

2018

6.3

2002

6.6

2003

6.7

2013

5.4

1969

7.8