1998

7.5

1991

6.8

1999

5.7

2007

6.6

1995

7.3

1990

7.0

1991

7.3

2007

6.1

1994

5.7

2008

6.9

2000

7.8

1982

6.7

2005

7.2

1987

6.5

2013

6.1

2003

6.2

1988

6.3

1994

5.7

2002

4.4

2002

5.4