2001

6.9

1990

6.8

1999

7.1

2003

8.3

1991

7.1

1994

7.4

1987

7.1

2007

5.6

2005

7.2

1986

6.7

2004

1.0

1982

6.2

1974

7.5

2001

7.5

1979

6.0

2014

5.4

1980

4.8

1985

7.8

1982

6.1

2000

5.0