1931

0.0

1977

7.4

2013

8.2

2000

7.1

2007

6.9

1987

5.6

1988

5.8

1995

7.3

2002

6.9

1950

6.8

2002

6.1

1969

1.0

2001

6.8

2001

6.9

2006

5.1

2003

6.6

2018

7.6

1932

6.4

1996

6.7

1972

6.2