2015

6.9

1992

5.3

1981

6.6

1984

7.4

1987

7.9

2006

5.7

2005

8.8

2000

6.2

2005

7.4

2002

8.2

1978

6.8

1983

5.2

2005

5.0

1986

4.0

1999

7.7

2015

0.0

2001

8.0

2017

6.5

2012

7.0

1987

7.1