2006

7.5

1990

6.5

2014

5.9

1979

6.5

2015

6.9

2003

6.3

2000

3.3

1967

6.6

2003

7.0

1999

7.1

1964

7.4

1985

6.2

1959

6.4

1993

7.0

2012

8.2

2006

6.9

2005

7.1

1965

7.7

2004

4.5

2015

7.5