1988

3.8

1997

6.8

1995

7.9

2007

4.5

2001

6.0

2003

6.5

2001

6.5

2004

5.0

2002

6.8

2023

6.2

2000

7.1

1998

4.6

1994

6.0

1991

6.5

2005

4.7