1994

6.7

2017

7.9

2006

8.0

2020

7.6

1978

6.8

2007

6.4

1992

5.4

2009

6.1

2001

7.0

1985

0.0

2007

7.7

1993

7.3

2018

6.3

2010

5.5

2019

7.0

2015

5.4

2020

5.9

1979

7.6

1985

6.6

2000

5.3