2001

7.3

1970

7.1

1964

7.1

2005

6.4

1996

6.4

1992

7.4

2017

6.9

1994

7.5

2017

5.0

2009

6.6

1980

6.6

2003

5.9

1997

6.1

1986

6.1

2007

4.0

1988

6.3

2002

6.8

2014

6.7

2025

0.0

2007

3.0