1973

2.0

1986

6.0

1999

6.5

1999

6.6

1970

5.6

1966

6.6

2008

7.3

1990

6.7

2002

6.4

2005

5.1

2008

7.2

1997

6.0

2002

5.3

1981

7.2

1993

6.6

2019

6.6

1977

7.0

2006

6.1

1996

6.2

2001

7.4