2000

5.5

2011

7.1

1992

7.7

2007

7.7

1968

6.9

1979

6.7

1998

5.1

1980

5.3

1975

7.5

2020

6.9

1984

7.0

2012

5.7

2001

5.4

1988

5.5

2017

6.8

1994

7.4

2004

5.5

1986

6.4

1994

5.7

2007

7.4