1988

7.8

1999

8.2

2003

7.1

2003

6.7

1995

5.8

1998

5.7

1980

6.2

2004

7.1

1988

7.0

1998

6.2

1998

6.5

2001

6.0

1992

6.0

2000

4.8

2022

7.4

2006

6.0

2000

7.4

1989

6.6

1997

6.7

2008

6.6