2004

6.0

1986

7.0

1991

6.1

1978

6.3

2003

6.2

1984

6.8

2002

5.6

1998

6.6

1985

6.2

2001

6.3

1993

7.0

1975

7.3

2003

6.8

2000

6.4

2006

4.3

2005

5.4

1995

6.8

2015

3.7

2021

6.1

1963

7.0