1987

7.1

1989

5.7

2001

6.7

2011

9.7

2012

9.7

1989

7.5

2012

9.4

2013

8.5

1984

6.6

2016

3.7

2002

6.3

2004

9.9

2006

6.7

1987

7.4

2000

7.2

1971

6.4

1979

6.2

2006

5.5

1942

7.0

1996

7.4