下表为全国人口的出生率,死亡率,自然增长率的统计数据表.(单位:%.)|年份``````|1991|1993|1995|1997|1999||出生率````|19.7|18.1|17.1|16.6|15.2||死亡率````|6.7 |6.6 |6.6 |6.5 |6.5 ||自然增长率|````|````|````|````|````|
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下表为全国人口的出生率,死亡率,自然增长率的统计数据表.(单位:%.)|年份``````|1991|1993|1995|1997|1999||出生率````|19.7|18.1|17.1|16.6|15.2||死亡率````|6.7 |6.6 |6.6 |6.5 |6.5 ||自然增长率|````|````|````|````|````|
下表为全国人口的出生率,死亡率,自然增长率的统计数据表.(单位:%.)
|年份``````|1991|1993|1995|1997|1999|
|出生率````|19.7|18.1|17.1|16.6|15.2|
|死亡率````|6.7 |6.6 |6.6 |6.5 |6.5 |
|自然增长率|````|````|````|````|````|
`````````````````````````````````````
(1)请分别计算出各年份的自然增长率,并填在上表中;(自然增长率=出生率-死亡率)
(2)用一副折线统计图表示全国人口自然增长率的变化情况.
``````````````````````````````````````````````````````````
|年份``````|1991|1993|1995|1997|1999|
|出生率````|19.7|18.1|17.1|16.6|15.2|
|死亡率````|6.7`|6.6`|6.6`|6.5`|6.5`|
|自然增长率|....|....|....|....|....|
下表为全国人口的出生率,死亡率,自然增长率的统计数据表.(单位:%.)|年份``````|1991|1993|1995|1997|1999||出生率````|19.7|18.1|17.1|16.6|15.2||死亡率````|6.7 |6.6 |6.6 |6.5 |6.5 ||自然增长率|````|````|````|````|````|
自己算算不就行了