1982

6.1

2000

4.7

2000

6.4

2003

6.0

2006

5.5

2013

4.8

2013

5.8

2017

7.7

1974

7.9

1996

6.5

2001

5.8

1988

3.6

1995

5.4

1996

5.2

2002

6.8

2001

6.5

1984

1.7

1987

1.0

1986

7.0

2014

5.6