信宜市五年来城乡居民生活改善情况:

注:恩格尔系数是指食物支出在家庭消费总支出中所占比重。一般来讲恩格尔系数高于60%就认为是绝对贫困。50%-59%之间是温饱。40%-49%是小康,20%-39%是富裕,20%以下是绝对富裕。 依据材料回答问题:
(1)图表反映了什么经济现象和问题?
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(2)信宜市城乡居民生活发生上述变化的原因有哪些?
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