1975

4.8

1990

7.7

1996

0.0

1979

0.0

2009

6.9

2001

5.7

1992

6.9

2009

5.9

2007

4.9

1984

5.9

2004

4.7

1986

5.5

2006

5.8

2021

6.1

1980

5.4

1997

5.1

2000

4.4

1972

5.1

1995

6.2

1998

6.0