1997

6.1

2015

5.9

2007

2.0

2000

1.9

2006

6.0

1985

7.1

2013

5.8

2008

4.7

1986

5.6

1986

6.9

2006

6.1

2007

5.3

2014

7.0

1991

0.0

2006

4.9

2016

5.0

2020

5.4

2016

5.1

2001

5.1

1981

6.9