Can't add title to mapbox map

I tried to create several maps and saved as png files. In cycle I got all mapes per year. I want to add which year on the map, and I tried title=i and fig.update_layout(title_text=i, title_x=0.5), but it does not work.

import plotly.express as px
import pandas as pd
year = [1980,1981,1983]
lat = [60.572959,  60.321403, 56.990280]
lon = [40.572759,  41.321203, 36.990299]
dataframe = pd.DataFrame(list(zip(year,lat,lon)),
               columns =['year', 'lat', 'lon'])
for idx, i in enumerate(sorted(dataframe['year'].unique())):
     #for x in range(1980,2022):
    sp = sp1[sp1['year']==i]
    fig = px.scatter_mapbox(dataframe, lat='lat', lon="lon",
                        color_discrete_sequence=["fuchsia"], zoom=2, height=400, opacity=0.3, title = i)
    fig.update_layout(mapbox_style="open-street-map")
    fig.update_layout(margin={"r":0,"t":0,"l":0,"b":0})
    fig.update_layout(title_text=i, title_x=0.5)
    fig.write_image("all/plot{idx}.png".format(idx=idx))

I put the picture of one map as example. I want to add year for every map in any place.

>Solution :

Use the annotations attribute of the previously created layout object in the update_layout method to add text – specified by the x and y coordinates.

fig.update_layout(annotations=[
    dict(text=i, x=0.5, y=0.5, font_size=15, showarrow=False)
])

Play around with the x and y coordinates to find the proper position you want to place your text at.