1997

7.1

1995

6.2

1970

6.8

1991

6.7

1992

6.0

2008

5.9

1990

5.5

2013

10.0

2003

4.0

2007

6.8

1982

6.5

2003

4.2

1995

6.2

2007

6.3

2004

6.5

2018

7.2

1979

2.0

2005

6.5

2004

5.5

1999

7.0