1995

6.5

1989

7.2

1999

7.7

2005

6.3

1993

8.6

2006

6.9

2004

6.3

1995

7.3

2001

7.9

2000

7.4

2001

6.2

1991

7.1

2003

7.2

1993

6.2

1995

8.0

1994

7.4

1949

6.2

2013

3.7

1953

4.0

1969

6.0