1932

7.4

2000

6.5

1975

7.8

2002

7.2

2005

6.9

1975

6.6

2006

5.3

1975

7.1

2009

3.9

2014

4.4

1960

5.6

1986

5.9

2007

6.5

1973

7.5

1996

6.0

2000

6.8

1986

6.2

1975

6.2

1996

5.9

2002

6.4