2007

7.2

2006

6.0

1996

6.9

1991

7.1

1994

6.8

1995

6.3

1997

6.0

2017

5.7

2005

6.2

2017

4.4

2002

6.7

2007

6.2

2008

5.7

2004

5.8

2007

5.5

2004

6.8

2014

4.6

1975

6.1

1990

6.3

1964

5.7