1999

0.0

2002

6.3

2001

6.8

2001

6.7

2005

6.5

2000

6.4

1988

4.3

2008

3.4

1970

5.6

1964

5.0

1966

7.4

2002

5.6

2003

7.4

2002

6.5

1974

8.1

1992

2.0

1986

3.0

2014

4.1

2001

6.0

2016

5.8