1999

5.8

1995

6.4

1982

7.6

1984

6.3

1993

7.7

1988

2.0

1995

7.3

1979

6.8

1984

7.3

1996

5.4

1992

6.6

1999

6.5

2007

5.3

2012

6.2

1998

7.1

2008

4.7

1999

8.3