1995

6.2

2000

5.3

1994

7.5

1988

4.3

1996

3.5

2010

7.7

1996

5.1

2002

8.0

1999

6.1

2014

5.9

1989

8.3

1993

5.0

1984

5.6

2000

3.0

1996

6.6

2005

6.1

1999

5.1

1995

4.8

2000

5.5