1995

6.5

1992

7.5

2007

6.9

2000

5.8

1976

5.6

2003

6.2

1994

6.6

1970

1.0

2002

6.4

2009

7.5

2004

5.6

1996

6.9

1992

5.0

2017

1.0

2009

5.4

2004

3.0

2009

4.7

2008

6.8

2019

1.3

2024

6.0