2000

6.3

1997

6.9

1998

6.6

2004

5.8

2001

7.2

2002

7.1

2023

9.5

2003

7.4

1988

6.5

2005

6.6

2005

6.2

2018

8.1

2007

6.7

1974

7.4

2009

2.0

1997

6.5

1999

5.7

1998

7.1

2004

7.5

2000

6.7