1989

7.2

2005

7.7

2004

4.6

1999

4.5

1992

6.9

2002

7.3

2004

7.3

2007

6.4

2005

7.1

2006

6.6

1997

7.2

2002

6.4

1978

7.2

2003

5.6

2012

6.7

2009

6.3

2006

6.1

1995

5.4

1997

4.4

2023

0.0