1972

7.1

2001

6.2

1962

8.0

1992

6.7

2014

3.5

2018

6.6

1993

6.3

2006

7.4

2004

7.0

2005

6.8

2006

6.0

2006

7.2

2007

7.3

2001

6.7

2002

7.0

1993

7.7

2005

6.6

1990

6.9

2006

6.8

1997

7.5