1982

5.7

2021

6.1

2014

7.7

1985

6.4

1990

6.6

2014

7.9

2015

6.0

1994

5.9

1997

4.5

1988

6.2

2001

6.4

2008

7.6

2013

5.4

1983

6.9

2015

5.2

2016

4.2

1991

6.5

2015

6.3

2007

6.9

2009

5.0