1997

6.6

1975

3.8

2006

5.2

2005

6.2

2003

7.2

1990

6.8

2001

6.9

2000

5.0

2014

5.4

2007

5.6

2005

7.2

1992

6.0

2017

5.3

1980

4.8

1986

6.7

2013

5.8

1950

6.7

1993

5.2

2001

5.8

2024

0.0