2006

6.1

2005

8.8

2000

6.2

1979

6.9

1999

7.7

1999

7.1

6.7

1993

7.7

2005

7.4

2002

8.2

2014

8.3

2014

7.0

2015

7.4

1955

5.3

1984

7.4

2006

10.0

1987

6.4

2004

0.0

2020

0.0

1993

2.0