2003

8.4

2007

7.9

2001

7.6

2007

8.5

1995

8.6

1990

6.9

2012

8.2

1998

7.8

1997

7.3

2003

8.2

1999

8.1

1981

7.4

2019

7.4

2012

6.8

2018

8.3

1976

8.0

2020

6.9

1997

7.1

2013

7.6

1975

7.7