1989

6.8

1975

7.2

1988

7.7

1994

8.5

2019

8.1

2007

7.8

2011

6.9

2018

6.9

1994

8.7

2000

8.2

2019

7.7

1999

8.2

2004

7.4

2015

7.6

1985

8.3

1981

7.3

2016

7.6

2014

8.5

2018

6.8

2018

6.8