2008

6.4

2015

6.7

1994

5.0

1989

6.2

1993

6.5

1995

6.7

1989

6.6

1990

4.8

1984

7.5

2012

5.9

1990

5.0

2007

4.0

1992

6.6

1991

7.4

2016

4.0