2003

6.1

1990

6.2

1991

6.8

1992

6.2

2008

7.3

2014

7.6

2006

4.7

2017

10.0

2023

6.4

1971

7.2

1993

6.3

1981

7.1

2006

6.9

2006

7.3

2008

6.6

2007

6.5

2004

7.0

2000

6.3

1986

5.8

1998

7.0