1994

3.6

2000

6.1

2006

6.7

1979

4.8

2003

6.3

2001

6.9

2003

6.4

2007

7.4

2002

5.5

2003

5.6

2006

4.4

1995

6.5

2006

5.4

1998

6.5

1990

5.8

1983

7.0

1990

6.0

2022

6.0

1997

6.6

2002

6.4