2003

5.7

2012

8.2

1998

8.1

1991

7.6

1994

5.9

2000

7.2

1984

7.5

2008

7.7

1987

6.5

2017

7.6

2015

6.9

2014

6.8

2006

6.4

2012

9.7

1987

7.4

1994

7.5

1977

6.4

1999

5.8

2010

6.6

2010

6.3