1973

3.7

2006

6.2

2019

7.0

1970

3.8

1997

7.6

1967

6.9

2012

0.0

2014

6.4

2000

3.5

2002

4.8

1975

4.9

2007

6.4

2006

6.3

1997

5.5

2015

6.4

2012

6.0

2001

7.4

1991

5.9

1996

7.0

2004

5.2