1995

7.4

1998

4.7

2011

7.2

1988

0.0

2001

7.0

2020

7.0

1971

6.4

2005

7.1

1989

0.0

1999

5.2

2014

0.0

2012

8.8

1993

7.8

1996

6.6

2015

6.8