1976

7.1

2007

6.6

2000

6.7

2017

0.0

2006

5.8

1988

5.9

2000

6.4

1994

5.2

2016

0.0

2005

6.9

1996

7.2

1998

7.5

2000

7.2

1991

5.9

2003

6.5

1997

6.5

1998

6.6

2003

6.8

2006

6.0

2018

7.3