1978

5.0

1999

7.1

1987

6.8

1982

6.1

2020

0.0

2016

7.3

1974

7.9

1996

6.5

1971

7.2

1997

5.0

1993

6.0

1993

6.6

1985

6.5

2001

5.8

1974

7.2

2002

6.4

1996

5.4

1994

4.9

1990

6.3

2006

4.3