1999

6.8

1985

7.7

1967

2.8

2001

6.4

2000

7.3

1970

4.1

2013

6.7

2000

6.1

2001

6.6

1986

6.7

2007

5.6

2005

7.2

1988

8.4

1986

6.9

1992

6.8

2007

7.2

1975

3.1

2002

5.9

2001

7.5

1979

6.0