stata小白，想做一个关于股市牛熊市的分析，需要处理数据并画折线图，得出折线图每隔三个月份标注一个大刻度，每个月份都有小刻度。同时需要将波谷到波峰的一段进行标注。数据如下：
CODE]
* Example generated by -dataex-. To install: ssc install dataex
clear
input str7 month float close
"2018-12"2493.9
"2018-11" 2588.19
"2018-10" 2602.78
"2018-9"2821.35
"2018-8"2725.25
"2018-7" 2876.4
"2018-6"2847.42
"2018-5"3095.47
"2018-4"3082.23
"2018-3" 3168.9
"2018-2"3259.41
"2018-1"3480.83
"2017-12" 3307.17
"2017-11" 3317.19
"2017-10" 3393.34
"2017-9"3348.94
"2017-8"3360.81
"2017-7"3273.03
"2017-6"3192.43
"2017-5"3117.18
"2017-4"3154.66
"2017-3"3221.63
"2017-2"3241.73
"2017-1"3159.17
"2016-12" 3103.64
"2016-11" 3250.03
"2016-10" 3100.49
"2016-9" 3004.7
"2016-8"3085.49
"2016-7"2979.34
"2016-6"2929.61
"2016-5"2916.62
"2016-4"2938.32
"2016-3"3003.92
"2015-9"3052.78
"2015-8"3205.99
"2015-7"3663.73
"2015-6"4277.22
"2015-5"4611.74
"2015-4"4441.65
"2015-3" 3747.9
"2015-2" 3310.3
"2015-1"3210.36
"2014-12" 3234.68
"2014-11" 2682.83
"2014-10" 2420.18
"2014-9"2363.87
"2014-8" 2217.2
"2014-7"2201.56
"2014-6"2048.33
"2014-5"2039.21
"2014-4"2026.36
"2014-3"2033.31
"2014-2" 2056.3
"2014-1"2033.08
"2013-12" 2115.98
"2013-11"2220.5
"2013-10" 2141.61
"2013-9"2174.67
"2013-8"2098.38
"2013-7" 1993.8
"2013-6"1979.21
"2013-5"2300.59
"2013-4"2177.91
"2013-3"2236.62
"2013-2"2365.59
"2013-1"2385.42
end
[/CODE]


并附上了从其他文章中得到的其他年份的折线图，多谢各位大神~