1987

7.1

1999

7.9

1999

6.2

2000

7.6

1994

7.8

2002

6.6

1995

7.3

2007

5.7

1993

7.0

1994

4.3

2005

5.8

1993

7.0

1995

7.8

1994

4.0

1988

5.2

1990

5.9