1963

1.0

1952

6.1

1990

5.7

2000

6.4

1993

7.9

1995

6.5

2008

7.6

1989

5.8

1999

7.3

1993

4.0

2001

6.0

1983

8.2

2015

0.0

2009

6.2

2002

7.4

1971

0.0

2013

5.8

1982

6.5

1990

6.0

1988

6.3