1992

6.2

1998

6.6

1997

7.5

1986

5.4

1994

6.4

1990

6.8

1985

6.8

1999

6.6

2003

5.1

1985

6.9

1999

5.5

1999

6.3

2002

7.0

2015

4.3

1991

5.3

1990

5.7

1997

6.3

2004

5.5

1999

6.0

1994

6.8