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You can set the minimum of both the axes to the value of the first dataPoint to start the graph from origin.
The axisY can be formatted to percentage by using labelFormatter(). And to change the date manually formateDate() can be used.
Spline chart can be used for achieving smooth line.
You can refer to this thread to populate data using database and PHP.
The markers can be showed only on hover by seting markerSize: 0 at dataSeries or dataPoint level.
Please take a look at this following example.