1999

4.1

1988

6.5

2000

7.2

2001

6.3

2016

5.8

2009

6.7

2005

7.2

1995

6.6

1960

7.5

1994

8.7

1995

7.0

2007

6.7

1960

6.4

1993

7.5

1990

7.5

2006

7.4

1995

6.5

2003

7.1

2016

7.3

2005

7.3