1962

6.9

2010

6.6

1971

6.8

1997

6.1

2015

4.6

1987

5.5

1964

7.0

2012

6.2

2007

5.4

2014

7.6

2015

7.6

1999

5.6

2019

7.7

2016

6.3

2020

8.4

2003

6.0

2000

7.2

2017

6.7

2004

5.7

1988

5.9