1995

6.6

2002

7.2

1999

6.8

1998

6.6

1993

5.5

2005

6.9

2005

4.3

2015

7.1

1983

5.0

1996

6.7

1972

3.0

1972

3.2

2007

4.0

1982

5.8

1997

5.8

2008

3.8

2016

7.6

2009

5.9

1994

4.3

1974

3.8