0.0

1994

6.0

2000

6.8

2004

6.1

2003

7.2

2019

9.0

1999

5.7

2005

5.9

1985

6.2

2004

4.9

1995

6.2

1977

6.3

2006

5.9

1998

5.6

1993

7.5

1991

5.3

2009

7.5

1950

6.8

1934

5.7

0.0