1987

7.1

1992

7.4

2006

1.8

1998

8.2

1994

6.6

1997

6.1

1995

7.2

2000

7.6

1991

5.5

2001

3.7

2012

0.0

1995

7.3

1991

6.5

2005

7.5

2002

7.9

1996

6.6

2009

7.5

2015

4.5

1993

7.7

2010

7.9

2017

8.1

2002

5.2

0.0

2002

7.3

2018

8.5

1992

4.4

2001

7.5

1994

5.6