1969

2.5

1995

1.0

2010

3.9

1996

6.6

2002

7.0

2005

6.3

2001

6.7

1999

6.8

1998

6.6

1993

5.6

2001

3.2

1999

2.9

2000

6.4

2001

5.8

2007

5.5

1970

3.8

1973

0.0

2012

4.0

1996

5.0

1997

1.0