1993

7.5

2005

4.4

1997

6.2

2021

2.0

1975

7.1

1968

0.0

2007

7.1

1984

6.8

2001

6.2

1985

6.6

1992

7.3

1993

6.7

2000

6.4

2005

5.9

1977

4.5

1995

5.8

2002

7.3

2006

6.8

1991

7.6

2017

7.0