0.0

1991

5.3

1995

6.2

2000

6.8

1998

5.6

2006

5.9

2004

6.1

2019

9.0

1985

6.2

1977

6.3

2003

7.2

1993

7.5

2005

5.9

1999

5.7

2004

4.9

1967

5.4

2023

6.5

0.0

2010

0.0

2007

6.0