1990

5.6

1992

5.8

1994

5.4

1990

6.2

1993

6.2

1992

4.2

1998

5.3

1982

2.0

1991

5.5

1997

5.7

2007

7.9

1986

0.0

2000

3.0

1992

5.5

1998

6.5

2013

5.0

1995

6.7

1986

5.5

2005

7.0

1985

0.0

2000

7.1

2016

4.0