Living standards

In a survey taken in 1994, 1000 New Zealanders over the age of 15 years were asked about their standard of living. 
A similar survey was carried out in 1985. Some of the results are given in the table below. 
The percentages are of those who said they were 'delighted' with their present standard of living.

Income
level
TOTAL
SAMPLE
Up to
$4,000
$4,001
to
$10,000
$10,001
to
$15,000
$15,001
to
$25,000
$25,001
to
$35,000
Over
$35,000
% delighted
(1985)
59% 61% 52% 58% 57% 73% 83%
% delighted
(1994)
39% 41% 30% 33% 34% 49% 52%
 
a)
 
Which income group had the fewest people who were delighted with their standard of living in 1994?
 
____________________
 
b)
 In general, are people happier or not so happy, with their income level in 1994 than they were in 1985?
 
_____________________
 
c)
Which income group showed the biggest drop in 'levels of delight' between 1985 and 1994?
 
____________________