1981

5.2

2001

6.0

1994

3.2

2002

2.2

1997

5.1

2003

4.3

2002

3.5

1994

1.0

2000

2.8

2000

5.5

2003

4.8

2003

3.1

2007

6.1

1995

2.0

2013

3.5

2000

4.3

1994

5.5