2013

4.1

1995

5.7

1992

5.6

1995

5.5

1991

6.9

2002

6.6

1997

8.0

1998

5.8

1990

1.0

1987

7.7

1993

6.0

1984

7.3

1988

4.9

1983

6.3

2012

2.1

1987

5.0

1989

4.6

1996

5.3

1991

6.0