1908年〜2017年の平均婚姻年齢(初婚・全婚姻)をグラフ化

from IPython.core.display import display, HTML

css = """
table.dataframe {
    font-size:.83em;
}
"""
display(HTML('<style>{}</style>'.format(css)))

from pandas import *

df = read_csv('marriage.csv',encoding='shift_jis')
df.head()

df.drop(['表章項目','/平均婚姻年齢及び夫妻の年齢差'],axis=1,inplace=True)
df = df.set_index(['時間軸(年次)'])
df = df.apply(to_numeric, errors="coerce").astype(float)
#df.reset_index(inplace=True)

from matplotlib.pyplot import *
from matplotlib.font_manager import FontProperties
from matplotlib import rcParams
style.use('ggplot')

fp = FontProperties(fname='/usr/share/fonts/opentype/ipaexfont-gothic/ipaexg.ttf', size=54)
rcParams['font.family'] = fp.get_name()
rcParams["font.size"] = "20"
fig, ax = subplots(figsize=(22,12))
df.dropna(how='any',inplace=True)
df.sort_index(ascending = True,inplace = True)
df[['平均婚姻年齢_初婚-夫','平均婚姻年齢_初婚-妻','平均婚姻年齢_全婚姻-夫','平均婚姻年齢_全婚姻-妻']].plot(ax=ax)
ax.legend(loc='lower right', fancybox=True, framealpha=0.5)
xticks(range(0,len(df.index),2),df.index[::2],rotation=90)
yticks(np.arange(22, 34.1, 1),
       ['{}歳'.format(int(x)) for x in np.arange(22, 34.1, 1)]);

fig, ax = subplots(figsize=(22,12))
df.dropna(subset=['平均婚姻年齢_初婚-夫','平均婚姻年齢_初婚-妻'],inplace=True)
df.sort_index(ascending = True,inplace = True)
df[['平均婚姻年齢_初婚-夫','平均婚姻年齢_初婚-妻']].plot(ax=ax)
ax.legend(loc='lower right', fancybox=True, framealpha=0.5)
xticks(range(0,len(df.index),2),df.index[::2],rotation=90)
yticks(np.arange(22, 34.1, 1),
       ['{}歳'.format(int(x)) for x in np.arange(22, 34.1, 1)]);