1995

7.3

1987

7.6

2002

7.6

1999

7.6

1998

7.3

2004

7.4

2000

7.5

1986

7.6

2006

6.7

2005

6.8

2007

6.4

2001

6.7

2003

5.8

1966

7.3

2013

6.0

2005

7.0

1996

6.6

1998

6.7

1989

7.1

2005

6.0