1993

7.0

2002

6.3

2016

5.4

2017

7.3

2014

7.1

2013

6.0

1961

7.7

2007

5.4

1976

7.8

1979

7.3

1982

6.9

1985

7.1

1990

5.8

2017

5.3

2018

5.6

2000

6.2

1996

5.7

1997

6.5

2003

6.5

1987

6.4