1999

6.8

1984

6.2

1985

7.8

1991

7.1

1994

7.4

2003

7.2

1999

7.1

2001

6.9

1985

7.2

1982

4.0

2009

7.5

1995

6.3

1971

6.0

2006

5.1

1986

6.7

1975

4.5

2004

4.7

1975

4.0

2014

5.1

1982

6.0