1982

6.0

2001

5.9

1986

6.6

2001

5.5

2001

7.8

2001

5.7

2002

3.3

2003

4.7

1985

6.2

1997

6.6

1994

5.8

1990

6.9

2001

6.3

2007

5.2

1968

6.5

1966

6.5

2002

5.4

1998

7.1

2005

6.2

2006

5.9