2006

6.3

2003

6.5

1990

6.7

1972

2.4

1990

4.2

1995

3.3

1999

7.1

1998

6.6

2017

6.0

1978

7.0

2001

5.1

1994

5.8

2003

6.1

1986

6.3

1978

6.5

1979

6.3

1981

6.1

1982

6.1

1987

5.7

2004

6.7