0.0

1974

0.0

1986

8.5

1996

5.6

1969

0.0

2006

8.1

1994

9.2

2021

0.0

2016

5.0

1993

6.9

1985

7.4

1988

7.2

1999

6.0

2000

8.2

1985

8.2

9.2

1960

7.4

1988

7.7

1999

7.7

2004

7.9