2005

6.7

2002

5.9

1999

6.8

1994

5.7

2001

6.8

1993

5.0

2007

7.4

2001

6.1

1977

3.3

1976

6.9

1986

6.7

1994

5.7

2013

10.0

2002

6.4

1997

6.6

1986

6.9

1998

6.3

2000

7.0

1992

3.3

2002

5.6